[start_time] => Array
                (
                    [0] => Array
                        (
                            [value] => DrupalCoreDatetimeDrupalDateTime Object
                                (
                                    [formatTranslationCache:protected] =>
                                    [inputTimeRaw:protected] =>
                                    [inputTimeAdjusted:protected] =>
                                    [inputTimeZoneRaw:protected] =>
                                    [inputTimeZoneAdjusted:protected] =>
                                    [inputFormatRaw:protected] =>
                                    [inputFormatAdjusted:protected] =>
                                    [langcode:protected] => en
                                    [errors:protected] => Array
                                        (
                                        )

                                    [dateTimeObject:protected] => DateTime Object
                                        (
                                            [date] => 2017-03-17 02:04:03.000000
                                            [timezone_type] => 3
                                            [timezone] => UTC
                                        )

                                    [stringTranslation:protected] =>
                                )